A 120-year-old legend concerning an empty circular patch in the North Carolina woods.

Treehouse motel and treehouse-building school.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

Quite simply the largest tree in the world (by volume).

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

An underground city of salt.

A legendary speakeasy bookstore returns from the brink.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

On the top floor of an upscale department store stands a lavish restaurant housed in a replica of a luxury French dining car.

Walk in the footsteps of the gods and straddle two tectonic plates.

Extraordinary sculpture garden created by an eccentric English poet.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A storybook European village in Berkeley.

A clear blue swimming hole with hidden caves, still unexplored.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

A small but immensely extravagant palace built by the "Night King."

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.